doggett



(No Model.) 3 Sheets-Si1eet 1.

E. DOGGETT.

STEAM MOTOR. No. 364,225, Patented June 7, 1887'.

WITNESSES; INVENTDR. 6am? 42 ;4-

3 Sheets-Sheet 2.

(No Model.)

' H. E. DOGGETT.

STEAM MOTOR.

Patented June 7, 1887,

(No Model.) a Sheets-Sheet 3. H E. DOGGETT.

STEAM MOTOR.

No. 364,225; Patented June 7, 1887 g s k N NR,

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U ITED STATES PATENT OFF CE.

HORACE E. DOGGEIT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO E. M. COOPER, OF SAME PLACE.

STEAM-MOTOR.

QPECIFICATION forming part of Letters Patent No. 364,225, dated June 7, 1887.

Application filed February 1, 1887. Serial No. 226,134.

(No model.)

To all whom it may concern.

Be it known that I, HORACE E. DOGGETT, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Steam- Motors, of which improvements the following is a specification.

The object of my invention is to provide a motor propelled by steam for running sewingro machines and other apparatus, and so constructed and arranged that dead-centers may be overcome, and direct and positive move ments of the apparatus actuated thereby always insured.

My invention consists in providing within two metallic plates or disks, forming a housing; preferably four cylinders, having chests for admitting steam thereto from asuppl y con nected therewith. These steam-chests in the outer ends of the cylinders are provided with valve mechanism actuated by means of a cam secured to a driving-shaft,and the steamchests separated from the piston-chambers of the cylinders by a circular plate, having a central opening therein, through which the steam passes in a downward direction when the valve mechanism is automatically raised, perniitting of the free movement of the pistons provided with connectingrods attached to a crank secured to the main drivingshaft of the machine within thehousing, and imparting by a direct and positive movement rotary motion to the main driving-shaft of the machine, to which the motor may be readily and quickly 5 applied. The respective cylinders are provided with exhaust-openings connected with a pipe which conducts the exhaust-steam off into any suitable receptacle.

The nature of my invention will be more 0 fully understood when taken in connection with the accompanying drawings, wherein I have shown the samein a form which has been found practically efficient in its application to sewing-machines, andin which- Figure 1 isa perspective View of so much of a sewing-machine as will serve to demonstrate how my improved motor may be applied thereto for operating the same. Fig. 2 is a front elevation thereof with one of the disks ,0 removed, showing the cylinders with their pistons in the different positions therein, and also the steanrsupply pipe connected with the respective cylinders. Fig. 3 is a transverse section on the line 2 z of Fig. 2; and Figs. 4 and 5 are respectively cross-sections on the lines a" a: and yyof Fig. 2, showing the cylinders and their pistons and connecting-rods attached to a crank secured to the main drivin shaft, and the steam-chests with theirvalt e mechanism automatically actuated by a cam secured to the same shaft.

Referring to the drawings for a further description of my invention, A is the main driving-shaft of the sewing'machine B, to which is chines from one motor, if so desired.

D and D are two metallic plates or disks, formlng a housing, and through the plate or disk D the main driving shaft A of the sew- 1ng-n1ach1ne revolves, when the motor is actuated in a manner to be presently fully explained.

E is a cam carried on the main drivin shaft A,-and E is a crank rigidly secured to the same shaft.

F, F, F", and F 3 are four cylinders attached to the disk D and arranged equidistant from each other, with steam-chests Gin the outer 8o ends of the respective cylinders, into which steam is admitted through the pipe H from a stea msu ppl y connected therewith in any suitable manner. The steam-chests Gare preferably provided with cap -plates 2', havin flanged rims which are fitted rigidly thereon? Projecting downward through the center of the cap-plates 'i are openings 2" for the reception of the stems of the puppet-valves J, and around which openings are provided suitable o packing-rings, 13 and abuttingagainst which are adjustable screws i for making steamt-ightjoints that is, for preventing the escape of steam from the respective steamchests G.

Parallel to and in line with the stems of the puppet-valves J are provided rods K, held in guides or bearings k and is, rigidly secured to the disk D. These rods K abut against the cam E, rigidly attached to the main driving shaft A, and are raised and lowered I00 thereby. The respective stems of the puppet-valves J are coupled to the rods K by means of cross connectingbars L, having eyes Z and Z, into which sct-screws Z and Z are inserted for rigidly holding the rods K and the stems of the puppet-valves J in proper position for performing their functions. The cross connecting-bars L have attached thereto retracting-springs M, having their opposite extremities held by hooks m, cast or otherwise secured to the respective cylinders of the motor.

N, N, N and Nare the piston-heads moving freely up and down within the respective cylinders, and to which are pivoted connectingrods n, a, a and a, held in bearings in the interior surfaces of the respective pistonheads, the opposite extremities of the pistonrods being secured, respectively, to a crankthe main driving-shaft A.

suitable source through the pipe H, and as the steam-chests G in the cylinders F, F and F are closed, the steam will pass, of course, by means of the pipe H, through into the steam-chest G of the cylinder F, which is open, and the puppet-valve J will have been raised by means of the cam E, aided by the rod K, to the position as shown in in Fig. 2, and the course of the steam, after its admission into the steam-chest G from the pipe H, will be in a downward direction into the'piston-chamber of the cylinder F, actuating the piston N and its connecting-rod n, thereby operating the crank E (secured to the main drivingshaft) one-fourth of a revolution to thelcft, by which time the steam-chestG of the cylinder F and the puppet-valve J thereof will have been raised by the cam E, aided by the rod K,causing a movement of the piston N'. The ex haust-steam from the piston-chambers of the respective cylinders will of course be conducted therefrom by means of the pipe B into any suitable receptacle or blow-off, and hence it will be observed that the operation will be continued for the movement of the pistons N and N of the cylinders F and F in regular succession in a similar manner to that above described, thereby actuating the main driving-shaft of the machine; and when desired the motor may be brought to a state of rest by simply turning the steam off by means of a stop-cock connected with the steam-supply pipe H in a well-understood manner.

It is obvious that modifications may be made in details of my invention without departing from the principle or sacrificing the advantages of the inVention-for instance, a greater or less number of cylinders may be used, if desired-but I prefer, however, to construct and arrange the parts of the motor in the manner hereinbefore described.

Having thus described the nature and ob jects of my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with two metallic plates, a shaft, and a cam secured to said shaft, of three or more cylinders providedwith steamchests and piston-chambers, a supply-pipe communicating with said steam-chests, and an exhaust pipe connected with said pistonchambers, puppet-valves provided in said steanrchests, and means operated by said cam for raising and lowering said valves, a crank secured to said shaft, and pistons with their connecting-rods attached to said crank, substantially as and for the purposes set forth.

2. The combination, with two disks and the driving-shaft of a machine, of four cylinders provided with steam-chests and piston-chambers separated from each other by a plate having a central opening therein, puppet valves provided in said steam-chests, a cam secured to said shaft, and means, substantially as described, operated thereby for actuating said valves, steam supply and exhaust pipes in direct communication with said cylinders, and a crank secured to said shaft and pistons with their connecting-rods attached to said crank, substantially as and for the pn rposes set forth.

3. The combination, with two disks, a shaft having a bearing in one of said disks, and a cam secured to said shaft, of a rod, K, held in bearings secured to one of said disks, a cross-bar suitably attached thereto, a cylinder having a steam-chest and a piston-chamber, a puppet-valve, the stem of which is secured to said crossbar and actuated by said cam, and a spring attached to said crossbar and cylinder, substantially as and for the purposes set forth.

4. In a steam-motor, the combination, with a cylinder having a removable cap-plate, a packing-ring in said plate, an adjustable screw abutting against said ring, and a puppet-valve playing freely up and down through said plate and screw, of a main drivingishaft, and two metallic disks forming a housing for said cylinder, a cam secured to said shaft, a rod, K, held in bearings in one of said disks, a crossbar secured to said rod and to the stem of said puppet-valve, and a helical spring attached to said cross-bar and cylinder, all arranged substantially as and for the purposes set forth.

In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HORACE E. DOGGETT. Vitnesses:

ANDREW ZANE, Jr., Tues. M. SMITH. 

